I sold my R6 in 2005 for two reasons.
In 2004 a very good friend of mine was killed by a car merging into her at 80mph. She left an 8 yr old child behind. That shook me up bad and I didn't touch the bike for 4 months.
Money. At the time, I needed to buy some other things and I didn't have money for bike payments and money to pay for everything else. I had to make a decision. I was also in debt up to my eye balls. I sold most of my toys in 2005.
The last few years I've been looking for any excuse to get another bike but I'm stuck on the money issue. My wife stays home with our two kids and I'm the sole bread winner. Once both the vehicles are paid off, I have a green light to purchase another bike.
I did keep my quad so I am able to get a lot of enjoyment out of that, but it's not the same.
2 years, 8 months and counting.